1. Definitions and bridge categories

1.1 Defining a bridge and its parts

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1.1.1 Terminology

Generally speaking, a bridge is an elevated structure, built in situ, enabling a roadway (known as a "span") to cross a natural or man-made obstacle: river, valley, road, railroad, canal, etc. The span can be a roadway (road bridge), a pedestrian bridge (footbridge), a railway bridge (railway bridge) or, more rarely, a waterway (canal bridge, as in the case of the de Gaulle bridge). The roadway may be a road (road bridge), pedestrian (footbridge), railway (railway...